Brake shoe



Dec. 29,1925- v 1,567,290

A. NELSON BRAKE SHOE Filed Jan. 1925 Patented Dec. 29, 1925.

UNITED STATES.

PATENT OFFICE.

ALBERT-Henson, or cnrcneo, ILLINQIS, nssrenon TO THE AMERICAN BRAKE anon a FOUNDRY company, or WILMINGTON, DELAWARE, A coarona'rron or DELA- BRAKE SHOE.

Application filed January 28, 1925.- Serial No. 4,655.

To all whom it may concern:

Be it known that I, ALBERT Nat-son, a cit zen of the United States residing at Chicago, in the county of dook and State of Illinois, have invented certain new and useful Improvements in Brake Shoes, of -Whh the following is a specification.

This invention relates to brake shoes and more especially to locomotive brake shoes of 10 that type which "are commercially known as center-fastening shoes and are provided with a single fastening lug located at or about the center. of the shoe to engage an openm provided. for in the brake head, examp es of 1 which are shown in U. S. Letters Patent No. 1,37 3,538 and No. 1,373,539 patented Aprll 5, 1921 to J. S. Thompson, assignor.

The invention has forits object to provlde a strong and substantial lug for a center- 2 fasteningshoe which is engaged with and supported by the reinforcing back of the shoe so that the forces and blows which are applied to the lug in handlingand n the application of the brakes in serv ce w1ll be distributed through the reinforcing back over a considerable area of the shoe and thereby avoid the danger of fracturing the body of the shoe beneath the lug which might happen if the forces or blows were transmitted by .the lug entirely and directly to that portion of the body of the shoe beneath the In The invention also has for its ob ect to provide a simple construction and arrangement of the lug and back, which can be manufactured at comparatively low cost, and easily assembled, and which will present a strong and substantial unit for embedment' in the body of the shoe andpreserve the shoe intact in service against the forces and. blows directed against the lug. y

And a further object of the inlvention is to provide anchorage for the body of the shoe under thelug and adjacent thereto whereby to strengthen the shoe and to hold the parts together in case of fracture in this portion of the body.

In the accompanying drawings I have shown a selected embodiment of the invention in which-- Fig. '1 is a perspective view showing the invention embodied with one form of reinforcing back;

Fig. 2 is a perspective view of the lug blank and Fig. 3 is a fra enta ers tive view of that part of th d back it wl iz h the lug is directly engaged;

Fig. 4 is a bottom plan view showing a portlon of the back with the lug engaged therewith;

Fig. 5 is a transverse sectional view of a brake shoe having the back and lug of Fig. 1 embedded in the body at the back thereof;

Flg. 6 is a sectional view on the line 6-6 of Fig. 5.

Fig. 7 is a sectional view on the line 77 of Fig. 5, and

Fig. 8 shows an opening in the back of another sha e which may be used.

Referrlng to the drawings, the reinforcing back 9 is provided with an opening 10 extending transversely of the back and having extensions at its ends which form in effect, slots 11, 11, extending parallel with the side edges of the back and of the shoeand of greater length than the width of the intermediate portion of the opening. The lug l2 ma be formed out of a strip of strap metal wh1ch is bent to form an arch having legs 13 which are cut away or reduced fQI a portion of their length forming shoulders 14. The lower reduced ends of the legs are adapted to engage the slots 11 and these parts are preferably proportioned so that theassembly can be readily effected while at the same time the parts will fit with a sufficient degree of accuracy to hold the lug in proper ahned' position with respect to the back. After the lug has been engaged with the back the reduced ends are bent outwardly, in opposite directions, and against the inner face of the back to form feet 15 which lock the lug to the back. The assembled back and lug con-' stitute a unit which is embedded in the body 16 of the brake shoe during the castin operation. The shoulders 14 engage the ack at the ends of the slots 11 and the projections 17 between the slots and forming the sides of the opening 10 in the back project inward of the lug and between the legs to space the legs apart and hold the lug rigidly in its proper position. For some purposes it will probably be entirely satisfactory to omit the projections 17 and make the opening as shown at 18, in Fig. 8, in which case the shoulders 14 engage the back at the ends of the sides of the opening.

My invention provides a strong and substantial structure which will res st the forces and blows, as well as the strains to wh1ch the lug and the shoe as a whole are subjected in service and to some of wh1ch the lug and the shoe are sub ected 1n handling. Whatever forces or blows are applied to the lug are transmitted from the lug to the reinforcing back and by the back are distributed over a comparatively wide area of the shoe so that the liability of these forces or blows being exerted in a manner to fracture the body of the'shoe .beneath the lug is practically eliminated. I prefer to employ the projections 17 because they perform an important function in providing an anchorage for the body metal of the shoe at the center lug. It will be noted by reference to Fig. 7 that the body metal will flow'during the casting operation up through the ppming 10 into the center lug and make interlocking engagement with the pro ections 17 to provide effective anchorage for that part of the body below the lug and ad acent thereto, so that in the event, of a fracture in this part of the body, it will be held together bv the anchorage afforded by engagement of the body metal with the projections 17. Thus the shoe may be continued in service even though the body is fractured in this portion.

I have illustrated in the drawings one type of back and lug which I have found entirely satisfactory but I would have it understood that I reserve the right to embody the invention with other backs and lugs and in other kinds of brake shoes and to make all other changes as fairly fall within the scope of the following claims.

I claim:

1. A brake shoe comprising areinforcing back having an opening therein extending transversely of the back, a fastening lug comprising a metal strap bent to form an arch andvhaving its legs engaged with said opening and bent outwardly in opposite directions under and transversely of the back, and shoulders at the edges of the legs di rectly engaging the back at the edge of the opening therein.

2. A brake shoe comprising a reinforcing back having an openingtherein extending transverselv of the back and slots at the ends of the opening extending longitudinally of the back, a fastening lug comprising a metal strap bent to form an arch and having its legs engaged with said slots and bent outarch and having its legs engaged with said I opening and bent outwardly in opposite directions under and transversely of the back, shoulders at the edges of the legs directly engaging the back at the edge of the opening therein, and projections forming sides for the opening in the back extending inwardly of the lug between said legs.

4. A brake shoe comprising a reinforcing back having an opening therein extending transversely of the back, a fastening.

lug comprising a metal strap bent to form an arch and having its legs engaged with said opening and bent outwardly in opposite directions under and transversely of the back, parts of the back engaging the sides and ends of the legs to prevent relative movement thereof, and shoulders at the edges of the legs directly engaging the back at the edge of the opening therein.

5. A brake shoe comprising a reinforcmg back having an openlng therein extending transversely of the back and terminating at its ends in parallel slots extending lengthwise of the back, a' fastening lug comprising a metal strap bent to form anarch and having its legs engaged with said slots and bent outwardly in opposite directions under and transversely of strap bent to form an arch and having its legs engaged with said opening, and a body cast on said back and lug and having a portion thereof extending up through the opening and interlockingly engaged with said projection.

7. A brake shoe comprising a reinforcing back having an opening therein. a fastening lug comprising a metal strap bent to form an arch and having its legs engaged with said opening. oppositely disposed projections on said back extending into said opening. and a body cast on the back and lug and having a portion thereof extend ing up through the opening and interlockingly engaged with said projections.

8. A brake shoe' comprising a reinforcing back having an opening therein extending transversely of the back and slots at the ends of the opening extending longitudinally of the back to form projections on the back between said slots and extending into said opening, a fastening lug comprising a metal strap bent to form an arch and having its le S engaged with said slots and bent outwar ly in opposite directions un-' der and transversely of the back, and a body cast on the back and lug and having a portion extending up through the opening and interflocleingly engaged with said projections.

9. A brake shoe comprising a reinforcing back having an opening therein, a fastening lug comprising a metal strap bent to form an archand having its legs engaged with said opening and bent to engage the under side of said back, there being. projections on the back extending into said opening between the legs of the ing, and a body cast on the back and lug and havin a portion extendingup into the lug an interlockin'gly engaged with said projections.

ALBERT NELSON. 

